Paul Ryan's chance for a Sarah Palin moment

August 29, 2012, 4:34 AM|In 2008, Gov. Sarah Palin was unknown to most Americans. She introduced herself with a rousing convention speech as she accepted the Republican vice presidential nomination. Paul Ryan will have an opportunity to define himself in his speech to the convention. CBS News political director John Dickerson talks to Charlie Rose and Norah O'Donnell about what Ryan might say.